Add docs to get_auto_lims

[FrancescoNegri]

As anticipated in #281, I added a few lines of documentation to the get_auto_lims function in the utils namespace.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.38%. Comparing base (3728499) to head (a4557b5).
Report is 26 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #290   +/-   ##
=======================================
  Coverage   89.38%   89.38%           
=======================================
  Files          10       10           
  Lines        1885     1885           
=======================================
  Hits         1685     1685           
  Misses        200      200           

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